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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 669 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.41² =
  2. 2.91² =
  3. 3.81² =
  4. 4.39² =
  5. 5.41² =
  6. 6.59² =
  7. 7.19² =
  8. 8.81² =
  9. 9.69² =
  10. 10.69² =
  11. 11.49² =
  12. 12.79² =
  13. 13.19² =
  14. 14.79² =
  15. 15.19² =
  16. 16.21² =
  17. 17.51² =
  18. 18.41² =
  19. 19.89² =
  20. 20.29² =
  21. 21.39² =
  22. 22.69² =
  23. 23.49² =
  24. 24.91² =
  25. 25.81² =
  26. 26.29² =
  27. 27.41² =
  28. 28.81² =
  29. 29.59² =
  30. 30.61² =
  31. 31.79² =
  32. 32.19² =
  33. 33.31² =
  34. 34.19² =
  35. 35.61² =
  36. 36.29² =
  37. 37.31² =
  38. 38.31² =
  39. 39.59² =
  40. 40.31² =

Answer key

  1. 1681
  2. 8281
  3. 6561
  4. 1521
  5. 1681
  6. 3481
  7. 361
  8. 6561
  9. 4761
  10. 4761
  11. 2401
  12. 6241
  13. 361
  14. 6241
  15. 361
  16. 441
  17. 2601
  18. 1681
  19. 7921
  20. 841
  21. 1521
  22. 4761
  23. 2401
  24. 8281
  25. 6561
  26. 841
  27. 1681
  28. 6561
  29. 3481
  30. 3721
  31. 6241
  32. 361
  33. 961
  34. 361
  35. 3721
  36. 841
  37. 961
  38. 961
  39. 3481
  40. 961

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